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2. Microphone connector - Wikipedia

   en.wikipedia.org/wiki/Microphone_connector

   Two pins are used for the mono headphone signal and two pins for the unbalanced microphone signal. The 4-pin XLR connector is also commonly used on amateur radio microphones, but transferring unbalanced audio instead, and using the 4th pin (with the common ground) for a push-to-talk (PTT) circuit activated by a button on the microphone.

3. Astatic Corporation - Wikipedia

   en.wikipedia.org/wiki/Astatic_Corporation

   Astatic also manufactured bullet style microphones, which are extremely popular among harmonica players. The original Astatic model JT-30 was introduced in late 1939. There were many variations in different colors such as the JT-30-C, W-30, 31, JT-31, JT-40, JT-50, W40, W80 and Model A.

4. Yaesu (brand) - Wikipedia

   en.wikipedia.org/wiki/Yaesu_(brand)

   Yaesu is a Japanese brand of amateur radio equipment, founded as Yaesu Musen Co., Ltd. (八重洲無線株式会社, Yaesu Musen Kabushiki-gaisha) in 1959 by a Japanese radio amateur Sako Hasegawa (call sign JA1MP [1]) in Yaesu, Japan, a district of Tokyo.

5. List of communications receivers - Wikipedia

   en.wikipedia.org/wiki/List_of_communications...

   Yaesu FRG-7000 Hobbyist 1977-1980 .25-30 Triple conversion Wadley loop AM, LSB, USB, CW 3 6 no 7 7 2 no Yaesu FRG-7700 Hobbyist 1981-1984 .015-30 AM, SSB, CW and FM (12) (72) 6 330 x 127 x 254 8 11 2 [76] Yaesu FRG-8800 Hobbyist 1984-1993 .015-30 triple conversion AM, SSB, CW, FM 12 6.1 334 x 118 x 225 8 38 2 CAT [77] Yaesu VR-5000 Hobbyist .1-2600

6. Yaesu VX series - Wikipedia

   en.wikipedia.org/wiki/Yaesu_VX_series

   The Yaesu VX series is a line of two sequences of compact amateur radio handheld transceivers produced by Yaesu. There is a line of ultra-compact lower-power dual-band (2 m and 70 cm) transceivers that started with the VX-1R and was later updated with the VX-2R and VX-3R.

7. Yaesu FT-817 - Wikipedia

   en.wikipedia.org/wiki/Yaesu_FT-817

   In the ND model Yaesu (Vertex) replaced the FETs with RD07MVS1 FET's but the problem may still exist. Be aware that the RF stage may remain sensitive to damage. [8] The internal battery should be removed if the radio is to be stored for an extended period. In the non-ND model, a failing battery can cause the finals to oscillate which destroys ...